NiFi ListenFTP Processor Default Data Port

[#1]

What is the default port used by the Apache NiFi processor ListenFTP for the data channel in active FTP mode? For the control channel the default port is 2221. Is the default port for the data channel in active mode 2220?

The default ports for FTP are 21 for control channel and 20 for data channel. Because ports below 1024 require root access, the NiFi default port for control channel is 2221. 

[#2]

@3markt, Welcome to our community! To help you get the best possible answer, I have tagged our NiFi experts @cotopaul @SAMSAL @TimothySpann who may be able to assist you further.

Please feel free to provide any additional information or details about your query, and we hope that you will find a satisfactory solution to your question.

[#3 · Accepted solution]

Under the cover this is just using Apache FTP Server

Depends on passive ports

https://mina.apache.org/ftpserver-project/configuration_passive_ports.html

Send is over passive

An example is here

https://gist.github.com/tspannhw/43dbc81b1634a7acb61fada1a3c19a4e